<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>数据统计</el-breadcrumb-item>
            <el-breadcrumb-item>数据报表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 2.为 ECharts 准备一个定义了宽高的 DOM  -->
            <div id="main" style="width: 750px;height:400px;"></div>
        </el-card>
    </div>
</template>

<script>
    // 导入echarts
    import * as echarts from 'echarts'
    // 使用lodash合并数据
    import _ from 'lodash'
    export default {
        data(){
            return{
                // 需要合并的数据
                options: {
                    title: {
                    text: '用户来源'
                    },
                    tooltip: {
                    trigger: 'axis',
                    axisPointer: {
                        type: 'cross',
                        label: {
                        backgroundColor: '#E9EEF3'
                        }
                    }
                    },
                    grid: {
                    left: '3%',
                    right: '4%',
                    bottom: '3%',
                    containLabel: true
                    },
                    xAxis: [
                    {
                        boundaryGap: false
                    }
                    ],
                    yAxis: [
                    {
                        type: 'value'
                    }
                    ]
                }
            }
        },
        created(){

        },
        // 此时页面上的元素已经被渲染完毕了
        async mounted(){
            // 3.基于准备好的dom，初始化echarts实例
            var myChart = echarts.init(document.getElementById('main'));
            const {data:res}=await this.$http.get('reports/type/1')
            if (res.meta.status!==200) {
                return this.$message.error('获取折线图数据失败')
            }
            // 4.准备数据和配置项
            const result=_.merge(res.data,this.options)
            // 5.展示数据
            myChart.setOption(result);
        },
        methods:{}
    }
</script>

<style lang="less" scoped>

</style>